Accumulator



FIG. 1 is a right elevational view of the accumulator;

FIG. 2 is a front elevational view thereof;

FIG. 3 is left elevational view a thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a rear plan view thereof; and,

FIG. 7 is a front left perspective view thereof.

The broken lines shown in the drawings represent portions of the accumulator that form no part of the claimed design. 

The ornamental design for the accumulator, as shown and described. 